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    /* 
    1.创建app----使用createApp
        let app = vue.reateApp({})
    2.把vue对象渲染到id为app的标签里
    3.data必须返回对象的函数
    4.vue3提出了app概念，避免了全局污染
    5.v-moldel---语法糖
    
    */
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